<template>
    <span>
        <input type="hidden" v-if="name" :name="name" v-model="checkedValue">
        <span :class="wrapClasses" @click="toggle">
            <span :class="innerClasses">
                <slot name="open" v-if="currentValue"></slot>
                <slot name="close" v-if="!currentValue"></slot>
            </span>
        </span>
    </span>
</template>
<script>
    import {oneOf} from '../../utils/assist';
    import Emitter from '../../mixins/emitter';

    const prefixCls = 'ivu-switch';

    export default {
        name: 'Switch',
        mixins: [Emitter],
        props: {
            name: String,
            data: [String, Array],
            value: {
                type: [Boolean, String, Number],
                default: false
            },
            disabled: {
                type: Boolean,
                default: false
            },
            size: {
                validator (value) {
                    return oneOf(value, ['large', 'small']);
                }
            }
        },
        data () {
            return {
                dataArray: [],
                checkedValue: null,
                currentValue: null
            };
        },
        mounted(){
            if (!this.data) {
                this.dataArray = [1, 0];
            } else if (Array.isArray(this.data) && this.data.length >= 2) {
                this.dataArray = this.data;
            } else if (this.data.indexOf(",") > 0 && this.data.split(",").length >= 2) {
                this.dataArray = this.data.split(",");
            } else {
                this.dataArray = [1, 0];
            }

            this.currentValue = eval(this.value);
            if (this.currentValue) {
                this.checkedValue = this.dataArray[0];
            } else {
                this.checkedValue = this.dataArray[1];
            }
        },
        computed: {
            wrapClasses () {
                return [
                    `${prefixCls}`,
                    {
                        [`${prefixCls}-checked`]: this.currentValue,
                        [`${prefixCls}-disabled`]: this.disabled,
                        [`${prefixCls}-${this.size}`]: !!this.size
                    }
                ];
            },
            innerClasses () {
                return `${prefixCls}-inner`;
            }
        },
        methods: {
            toggle () {
                if (this.disabled) {
                    return false;
                }

                const checked = !this.currentValue;
                this.currentValue = checked;
                this.$emit('input', checked);
                this.$emit('on-change', checked);
                this.dispatch('FormItem', 'on-form-change', checked);

                if (this.currentValue) {
                    this.checkedValue = this.dataArray[0];
                } else {
                    this.checkedValue = this.dataArray[1];
                }
            }
        },
        watch: {
            value (val) {
                this.currentValue = val;
                if (this.currentValue) {
                    this.checkedValue = this.dataArray[0];
                } else {
                    this.checkedValue = this.dataArray[1];
                }
            }
        }
    };
</script>
